Experimental investigation of a diffuser-integrated vertical axis wind turbine

The increase in energy demand and environmental pollution issues has led to the growth of utilizing renewable energy. Wind energy has become one of the main alternatives for power generation. In order to enhance the performance of the horizontal axis wind turbine (HAWT), the application of a diffuse...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2020-03, Vol.463 (1), p.12153
Main Authors: Wang, X.H., Wong, K.H., Chong, W.T., Ng, J.H., Xiang, X.B., Wang, C.T.
Format: Article
Language:English
Subjects:
Aerodynamic characteristics
Alternative energy sources
coefficient of power
diffuser
Diffusers
Energy demand
experiment
Flat plates
Fluid flow
Horizontal Axis Wind Turbines
Low pressure
Renewable energy
tip speed ratio
Turbines
Vertical axis wind turbine
Vertical axis wind turbines
Wind power
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Summary:The increase in energy demand and environmental pollution issues has led to the growth of utilizing renewable energy. Wind energy has become one of the main alternatives for power generation. In order to enhance the performance of the horizontal axis wind turbine (HAWT), the application of a diffuser is one of the innovative methods. At present, research on deploying the diffuser on the vertical axis wind turbine (VAWT) remains scarce. This paper presents the experimental study on the aerodynamic characteristics of a small H-rotor VAWT integrated with a diffuser. The diffuser comprises a pair of flat plates with an inclined angle of 30° at the outlet, with the VAWT is located between the diffuser. A comparison between the turbine performance with and without the diffuser has been conducted. From the experiment, it shows that with the presence of the diffuser, the performance of the VAWT has increased significantly. The power obtained for the bare turbine and with the diffuser is 0.38 W and 0.48 W respectively which is increased by about 26.3% and occurring at 300 rpm. Moreover, with the diffuser, the incoming velocity is also increased. This is due to the presence of the diffuser which enables the flow expansion and creates a low-pressure region at the downwind; inducing a higher incoming wind flow to the VAWT and enhancing its performance. In addition, the rotational speed and a better self-start ability can be achieved with the presence of the diffuser.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/463/1/012153